Society of Robots - Robot Forum
Electronics => Electronics => Topic started by: acar25 on August 26, 2010, 12:05:35 PM
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I have had an idea of making a robotic arm. A one-jointed arm, that joint being the elbow.
I need to control a servo with a potentiometer. when the potentiometer is turn farthest left (or lowest value) the arm is contracted. When the potentiometer is at the farthest right (or highest value) the arm is extended.
Any advice?
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Any advice?
On what, specifically? Finding a servo? Building your own servo? Interfacing it to something (if so, to what)?
EDIT: Oh, didn't catch your point - driving a servo based on potentiometer reading, versus just controlling a servo that contains a potentiometer.
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Hi,
I need to control a servo with a potentiometer. when the potentiometer is turn farthest left (or lowest value) the arm is contracted. When the potentiometer is at the farthest right (or highest value) the arm is extended.
Any advice?
Discard the electronics in the servo (except the H-bridge). Then use a dual comparator chip (eg. LM339) to make a window comparator that compares the two potentiometers (the one in the servo and the external one) and control the bridge from the outputs.
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Or buy a servo driver for $5